JP2002195172A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably support thrust load acting on a turning scroll using a plurality of spherical bodies to stabilize the behavior of the turning scroll when performing compression operation. SOLUTION: For example, four thrust load support bodies 16 are provided by making them apart from each other in the peripheral direction between a thrust receiver 7 of a casing 1 and a rear surface of the turning scroll 12. Moreover, the thrust load support body 16 consists of a spherical body storage case 17 provided by fixing it to the thrust receiver 7 and three spherical bodies 18 provided in the spherical body storage case 17. When operation is performed, each spherical body 18 of the thrust load support body 16 rolls between the thrust receiver 7 and the rear surface of the turning scroll 12 by following the turn movement of the turning scroll 12 to support a thrust load acting on the turning scroll 12 by the spherical body 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type fluid machine suitable for use in an air compressor, a vacuum pump, and the like.

[0002]

2. Description of the Related Art Generally, a scroll type fluid machine includes a casing, a fixed scroll provided in the casing, a drive shaft rotatably provided in the casing,
A revolving scroll that is rotatably provided at the tip end of the drive shaft and defines a plurality of compression chambers with the fixed scroll.

[0003] In this type of scroll fluid machine according to the prior art, the drive shaft is rotationally driven from the outside, and the orbiting scroll is orbited with a fixed eccentricity with respect to the fixed scroll to thereby make air or the like sucked from the suction port. Is sequentially compressed in a compression chamber defined between the fixed scroll and the orbiting scroll, and the compressed fluid is discharged from the discharge port to the outside.

Some scroll-type fluid machines have a thrust load support member provided between a casing and a back surface of the orbiting scroll to support a thrust load acting on the orbiting scroll (for example, Japanese Patent Application Laid-Open No. H11-11011). -28
No. 0671).

[0005] Then, the thrust load supporting member is composed of a spherical body accommodating case fixed to the casing by a sphere rollably contact the rear surface of the casing and the orbiting scroll is accommodated in the spherical body accommodating the case .

In this prior art, the sphere in the sphere housing case is rolled between the casing and the orbiting scroll in accordance with the orbiting operation of the orbiting scroll, and the thrust load acting on the orbiting scroll is made by the sphere. It has a configuration to support.

[0007]

In the scroll type fluid machine according to the prior art described above, for example, four sphere housing cases are provided in the casing, and two spheres are housed in each of the sphere housing cases. By contacting each of these spheres with the casing and the orbiting scroll, a thrust load acting on the orbiting scroll is supported.

However, since the spheres accommodated in each sphere accommodation case vary in their processing dimensions, when each sphere is mounted between the casing and the orbiting scroll, substantially three of these spheres are used. only pieces comes into contact with the orbiting scroll and the casing.

For this reason, it is difficult to uniformly disperse and support the thrust load acting on the orbiting scroll on all the spheres, and there is a problem that the behavior of the orbiting scroll becomes unstable. Further, there is a problem that the thrust load is concentrated on some of the spheres and the life of the spheres is shortened.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a thrust load acting on the orbiting scroll during operation by a plurality of spheres provided between the casing and the orbiting scroll. can be stably supported, it is possible to stabilize the behavior of the orbiting scroll, and its object is to provide a scroll fluid machine which is adapted enhances the life of the spheres and the like.

[0011]

Means for Solving the Problems] To solve the problems described above, the scroll fluid machine according to the present invention includes a casing, a fixed scroll provided in the casing,
A drive shaft rotatably provided on the casing, a orbiting scroll defining a plurality of compression chambers between the drive shaft and the fixed scroll provided at the tip end of the drive shaft, and a rotation of the orbiting scroll. A thrust load supporting member provided between the casing and the back surface of the orbiting scroll to support a thrust load acting on the orbiting scroll.

[0012] The feature of the configuration in which the invention of claim 1 is employed, the thrust load supporting body includes a spherical body accommodating case provided fixedly to either of the back face of the casing and the orbiting scroll, the Three or more spheres are provided in a sphere accommodating case, and are constituted by spheres which are in rolling contact with the casing and the back of the orbiting scroll; This is the configuration of the arrangement.

[0013] By having such a configuration, it is possible to contact the three or more spheres housed in a sphere accommodating case for each thrust load support and the back of the casing and the orbiting scroll, the orbiting these respective spheres The thrust load acting on the scroll can be stably supported.

Further, according to the invention of claim 2, a partition member for holding the respective spheres in a non-contact state with each other is provided in the sphere housing case. With this configuration, when the spheres roll between the casing and the orbiting scroll, the spheres do not rub against each other, and wear of the spheres can be prevented.

Further, the invention of claim 3, is on at least one of the back surface of the casing and the orbiting scroll is provided a recessed portion at a position corresponding to the sphere, is in the concave recess abuts with the spherical body The configuration is such that a contact member is provided.

Accordingly, even when the casing or the orbiting scroll is formed of a member softer than the sphere, the contact member can prevent the sphere from directly contacting the casing or the orbiting scroll, and the casing or the like can be formed by the sphere. Wear and damage can be prevented.

Furthermore, the invention of claim 4, in the recessed portion has a configuration providing a biasing member for biasing the contact member toward the sphere. In this case, the contact member can be pressed against the sphere by the urging member, and in this state, the sphere can be stably contacted with the contact member.

Furthermore, the invention according to claim 5 is configured such that a rattling preventing means for preventing the contact member from rattling in the concave concave portion is provided between the concave concave portion and the contact member. . In this case, the contact member can be prevented from rattling in the concave portion by the rattling preventing means, and the sphere can be stably contacted with the contact member.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a scroll type air compressor will be described in detail as an example of a scroll type fluid machine according to an embodiment of the present invention with reference to the accompanying drawings.

FIGS. 1 to 6 show a first embodiment of the present invention. Reference numeral 1 denotes a casing forming an outer frame of a scroll type air compressor. The casing 1 has a bottomed cylindrical shape. A lower motor case 2 and an upper motor case 3 having a closed cylindrical shape disposed above the motor case 2.
When the thrust receiving to be described later provided on the motor case 3 7
And is constituted by. An annular flange 3A is integrally formed on the outer peripheral side of the upper end of the motor case 3.

An electric motor 4 is accommodated and provided in the motor cases 2 and 3. The electric motor 4 includes a stator 5 fixedly provided between the motor cases 2 and 3 and a stator 5. 5 is constituted by a rotor 6 provided on the inner peripheral side and a drive shaft 9 described later.

Numeral 7 denotes a thrust receiver fixedly provided on the motor case 3 of the casing 1. The thrust receiver 7 has an annular plate portion 7A and an annular plate portion 7A as shown in FIGS. A plurality of cylindrical portions 7B, 7B,... Extending downward from the outer peripheral side at intervals in the circumferential direction.

The cylindrical portion 7B of the thrust receiver 7 is fixed to the flange portion 3 of the motor case 3 by a fixing bolt 8D described later.
A is fixed to A and receives a thrust load acting on the orbiting scroll 12 between the ball 18 and the orbiting scroll 12. Further, the thrust receiving 7 3, annular case mounting groove 7C the spherical housing case 17 to be described later as shown in FIG. 4 is mounted, 7C, ... it is formed.

Reference numeral 8 denotes a fixed scroll provided on the thrust receiver 7 of the casing 1. The fixed scroll 8 includes a disk-shaped end plate 8A disposed so as to coincide with an axis of a drive shaft 9 described later, It is composed of a spiral wrap portion 8B erected on the surface of the end plate 8A and a cylindrical portion 8C protruding downward from the outer edge side of the end plate 8A. The fixed scroll 8 is integrally attached to the motor case 3 together with the thrust receiver 7 using a fixing bolt 8D or the like.

[0025] 9 is a drive shaft rotatably provided via respective bearings 10, 11 to the motor casing 2 of the casing 1, the drive shaft 9, the lower end side (base end side) of the electric motor 4 It is integrally attached to the rotor 6, and the upper end side (tip side)
Is a crank 9A. The crank 9A of the drive shaft 9, as shown in FIG. 1, the axis is eccentric by the dimension δ with respect to the axis of the drive shaft 9.

[0026] 12 is pivotally provided with orbiting scroll opposite to the fixed scroll 8 on the upper end side of the drive shaft 9,
The orbiting scroll 12 has an end plate 12 formed in a disk shape.
A and a spiral wrap portion 12B provided upright on the front side of the end plate 12A. A boss 12C is provided on the orbiting scroll 12 at the center of the rear side of the end plate 12A so as to project therefrom.
Is rotatably mounted on the crank 9A.

The orbiting scroll 12 is disposed so as to overlap with the wrap portion 8B of the fixed scroll 8 by, for example, 180 degrees.
A plurality of compression chambers 13, 13,... Are defined between 2B. At the time of the scroll type air compressor operation, while the suction air to the outer peripheral side of the compression chamber 13 through the suction port 14 provided on the outer peripheral side of the fixed scroll 12, the air orbiting scroll 12 is orbiting motion by a drive shaft 9 Then, the compressed air is sequentially compressed in each compression chamber 13, and finally the compressed air is discharged from the compression chamber 13 on the center side to the outside through the discharge port 15 provided at the center of the fixed scroll 12.

[0028] 16, 16, ... in the four thrust load supporting member disposed between the end plate 12A back of the thrust receiving 7 and the orbiting scroll 12 of the casing 1, the thrust load supporting member 16, described later spheres Housing case 17 and sphere 1
It is constituted by 8, and supports the thrust load acting on the orbiting scroll 12.

[0029] 17, 17 in the sphere housing case provided spaced at substantially equal intervals along the circumferential direction on the thrust receiving 7 of the casing 1, the spherical body accommodating case 17 is formed in a cylindrical shape, the thrust It is provided in the case mounting groove 7C of the receiver 7 so as to be fitted and fixed integrally.

Reference numerals 18, 18,... Denote spheres provided so as to be rollable between the thrust receiver 7 of the casing 1 and the rear surface of the end plate 12A of the orbiting scroll 12. The spheres 18 are, as shown in FIGS. , is formed by using a steel material, they are accommodated respectively in each sphere accommodating case 17 3 as one set.

[0031] In this case, the center O of these three spheres 18
1, O2 and O3 are arranged at equal intervals on the same virtual circle R as shown in FIG. Then, the sphere 18 by contacting rollably on the end plate 12A back of the thrust receiving 7 and the orbiting scroll 12 has a configuration for supporting the thrust load acting on the orbiting scroll 12.

Reference numeral 19 denotes a thrust receiver 7 of the casing 1.
In Oldham ring slidably provided between the orbiting scroll 12 and, the Oldham ring 19 is thrust receiving 7
The rotation of the orbiting scroll 12 is prevented by being guided in two axial directions orthogonal to each other.

The scroll-type air compressor according to the present embodiment has the above-described configuration. Next, the operation of the scroll-type air compressor will be described.

First, when the drive shaft 9 is rotated by the electric motor 4, the orbiting scroll 12 makes a circular motion (orbiting motion) having a turning radius δ about the drive shaft 9, and the orbiting scroll 12 and the wrap portion 8 B of the fixed scroll 8 are moved. The compression chambers 13, 13,... Defined between the orbiting scroll 12 and the wrap portion 12B are continuously reduced. As a result, while the outside air sucked from the suction port 14 of the fixed scroll 8 is sequentially compressed in each compression chamber 13, the compressed air is stored in the outside air tank (not shown) or the like from the discharge port 15 of the fixed scroll 8. .

At this time, the sphere 18 of each thrust load support 16 follows the orbiting movement of the orbiting scroll 12 and the thrust receiver 7 of the casing 1 and the orbiting scroll 1
Since it rolls between the second end plate 12A and the rear surface, the thrust load acting on the orbiting scroll 12 can be supported by the sphere 18, and the Oldham ring 19 is smoothly slid and displaced between the thrust receiver 7 and the orbiting scroll 12. be able to.

In this embodiment, three spheres 18 are housed as a set in the sphere housing case 17 of each thrust load support 16, and the centers O 1, O 2, and O 3 of these three spheres 18 are provided. O3 is arranged not on the same straight line as described in the related art but along the same virtual circle R as shown in FIG.

Therefore, during operation, all three spheres 18 can be brought into contact with the thrust receiver 7 and the orbiting scroll 12 for each of the thrust load supports 16, and the thrust acting on the orbiting scroll 12 in this state. The load can be stably supported.

Thus, in this embodiment, the thrust load acting on the orbiting scroll 12 can be evenly dispersed and supported by all the spheres 18 of the thrust load support 16, and the behavior of the orbiting scroll 12 is stabilized. be able to. In addition, it is possible to eliminate the problem that the thrust load acts only on a part of the spheres 18 among the spheres 18 and reduce wear and damage of the spheres 18. The life can be extended.

Next, FIGS. 7 to 9 show a second embodiment of the present invention. The feature of this embodiment is that each sphere is placed in a non-contact state in the sphere housing case of the thrust load support. The configuration is such that a partition member is provided to keep the distance.

[0040] In this embodiment, the same reference numerals to the same components as the first embodiment described above, and description thereof is omitted.

Reference numeral 21 denotes a thrust load support used in the present embodiment. The thrust load support 21 is attached to the case of the thrust receiver 7 in substantially the same manner as the thrust load support 16 described in the first embodiment. A sphere housing case 22 fixedly provided in the groove 7 </ b> C, three spheres 23 housed in the sphere housing case 22, and a sphere housing case 22.
And a three-pronged partition member 24 interposed between the respective spheres 23.

Here, the partition member 24 is, for example, a sphere 2
Is formed of a resin material having a soft self-lubricating than 3. The partition member 24 is composed of three plate-like portions 24A, 24A,... Arranged radially from each other, and holds the respective spheres 23 in a non-contact state.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained.

In particular, in the present embodiment, the partition member 24
, The spheres 23 are kept in a non-contact state, so that when the spheres 23 roll between the thrust receiver 7 and the end plate 12A of the orbiting scroll 12, it is possible to eliminate the problem that the spheres 23 rub against each other. Wear, deformation and the like can be reduced and the life thereof can be extended.

Next, FIG. 10, FIG. 11 shows a third embodiment of the present invention, features of this embodiment, the rear surface of the thrust receiving the orbiting scroll casing concave at positions corresponding to the spherical A concave portion is provided, and a contact member for contacting a sphere is provided in the concave concave portion.

In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes four thrust load supports (only one is shown) used in the present embodiment. The thrust load supports 31 are substantially the same as the thrust load supports 21 according to the second embodiment. A spherical housing case 32 provided to be fitted in a large-diameter portion 35B of a recess 35 described later.
When three spheres 3 provided in the spherical body accommodating case 32
3 and a partition member 34 (see FIG. 11) provided between the respective spheres 33.

[0048] 35 is a sphere 33 of the thrust load support 31
In the recessed portion provided on the thrust receiving 7 in a position corresponding to the,
The concave portion 35 is formed as a bottomed stepped hole composed of a small diameter portion 35A and a large diameter portion 35B.

Reference numeral 36 denotes a contact member fitted and provided in the recess 35 on the thrust receiver 7 side. The contact member 36 is, for example, a steel material having a hardness equal to or higher than that of the sphere 33. Te formed on the stepped cylindrical shape, and is configured to abut a spherical 33.

[0050] 37 is a sphere 33 of the thrust load support 31
A concave portion provided on the rear side of the end plate 12A of the orbiting scroll 12 at a position corresponding to the concave portion 37. The concave portion 37 has a bottom with a small-diameter portion 37A and a large-diameter portion 37B almost similarly to the concave portion 35. Is formed as a stepped hole.

[0051] 38 is recessed portion of the orbiting scroll 12 side 37
The contact member provided by fitting into the contact member 38
Is formed in a stepped cylindrical shape using a steel material having a hardness equal to or higher than the sphere 33, and is configured to contact the sphere 33 together with the contact member 36.

[0052] Thus, in thus configured present embodiment, it is possible to obtain substantially the same operational effects as the first embodiment.

In particular, in this embodiment, the contact members 36 and 38 are provided on the thrust receiver 7 side and the orbiting scroll 12 side, respectively.
And the contact members 36 and 38 are formed with a hardness equal to or higher than that of the sphere 33.

[0054] with this order, to form a spherical body 33 with a steel such as SUS, thrust receiving 7, the orbiting scroll 1
2 even when made of a soft aluminum or the like than spherical 33, by causing the contact member 36, 38 into contact with the sphere 33, the thrust receiving 7, orbiting scroll 12 is spherical 3
3 prevents wear and damage.
Even if the contact members 36, 38 are damaged, the contact members 36, 38 are not provided with the concave portions 35, 37.
It can be easily removed and replaced.

Next, FIGS. 12 and 13 show a fourth embodiment of the present invention. The feature of this embodiment is that the thrust receiver of the casing and the back of the orbiting scroll are recessed at positions corresponding to the spheres. A depression is provided, and a contact member that contacts the sphere and an urging member that urges the contact member toward the sphere are provided in the depression.

In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0057] 41 in the four thrust load support for use in this embodiment (only one shown), the thrust load supporting member 41 is fitted in the large diameter portion 45B of the recessed portion 45 to be described later A plurality of spheres 43 provided in the sphere housing case 42, and each of the spheres 43.
Is constituted by the partition member 44 (see FIG. 13) provided between.

Reference numeral 45 denotes a sphere 43 of the thrust load support 41.
In the recessed portion provided on the thrust receiving 7 in a position corresponding to the,
The concave portion 45 is formed as a bottomed stepped hole composed of a small diameter portion 45A and a large diameter portion 45B.

[0059] 46 is a contact member which is provided fitted into the recessed portion 45 of the thrust receiving 7 side, the abutment member 46, using a steel material having equal or hardness, for example, a sphere 43 And is in the shape of a stepped column, and is in contact with the sphere 43.

Numeral 47 denotes a disc-shaped rubber plate as an urging member provided between the concave recess 45 on the thrust receiver 7 side and the contact member 46 and provided in the small diameter portion 45A. 47 is
The contact member 46 has a structure which always urged toward the sphere 43.

Reference numeral 48 denotes a sphere 43 of the thrust load support 41.
And in the recessed portion provided in the end plate 12A back side of the orbiting scroll 12 at the corresponding position, the concave recess 48, the small diameter portion 48
A and a large-diameter portion 48B form a bottomed stepped hole.

[0062] 49 is recessed portion of the orbiting scroll 12 side 48
The contact member provided by fitting into the
Is formed in the shape of a stepped column using a steel material or the like having a hardness equal to or higher than the sphere 43, and is configured to contact the sphere 43 together with the contact member 46.

Reference numeral 50 denotes a concave portion 48 on the orbiting scroll 12 side.
The rubber plate 5 is a disc-shaped rubber plate as an urging member provided in the small-diameter portion 48A and located between the
0 is a configuration in which the contact member 49 is constantly biased toward the sphere 43.

Thus, the present embodiment having such a configuration can provide substantially the same operation and effect as the third embodiment.

In particular, in the present embodiment, the contact members 46 and 49 are always urged toward the sphere 43 by the rubber plate. Therefore, even if the processing dimensions of the sphere 43 vary, 43 abutment member all thrust receiving 7 side 4
6 and the contact member 49 on the orbiting scroll 12 side can be always stably contacted, and each sphere 43 can be smoothly rolled between the thrust receiver 7 and the orbiting scroll 12 during operation.

Next, FIG. 14 shows a fifth embodiment of the present invention. The feature of this embodiment is that a thrust receiver of a casing and a rear concave portion of a revolving scroll are provided, and the concave portion is provided in the concave portion. A contact member that contacts the sphere, an urging member that urges the contact member toward the sphere, and an O-ring for preventing the contact member from rattling in the concave portion. It is in.

In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 51 denotes four thrust load supports (only one is shown) used in the present embodiment. The thrust load supports 51 are substantially the same as the thrust load supports 21 described in the second embodiment. Similarly, the large diameter portion 54 of the recessed portion 54 to be described later
B, a sphere housing case 52 fitted in the sphere housing case, three spheres 53 provided in the sphere housing case 52, and a partition member (not shown) provided between the spheres 53. It consists of.

Reference numeral 54 denotes a sphere 53 of the thrust load support 51.
In the recessed portion provided on the thrust receiving 7 in a position corresponding to the,
Concave recess 54, and a small-diameter portion 54A and the large-diameter portion 54B.

Reference numeral 55 denotes an abutting member provided by fitting into the concave recess 54 on the thrust receiver 7 side. The abutting member 55 is made of a steel material having a hardness equal to or higher than that of the sphere 53. It is formed on the stepped cylindrical shape, and is configured to contact with the sphere 53.

Reference numeral 56 denotes a rubber plate serving as an urging member provided in the small-diameter portion 54A and located between the concave recess 54 on the thrust receiver 7 side and the contact member 55. The contact member 55 is constantly biased toward the sphere 53.

An O-ring 57 is provided between the small diameter portion 54A of the concave portion 54 and the contact member 55 and is provided on the outer peripheral side of the contact member 55 and serves as anti-rattle means. The ring 57 is interposed between the small diameter portion 54A of the concave portion 54 and the contact member 55, and prevents the contact member 55 from rattling inside the concave portion 54.

Reference numeral 58 denotes a sphere 53 of the thrust load support 51.
A concave portion provided in the orbiting scroll 12 at a position corresponding to the concave portion 58. The concave portion 58 has a small diameter portion 58A and a large diameter portion 58B.

[0074] of 59 orbiting scroll 12 side recessed portion 58
The contact member provided by fitting into the contact member 59
Is formed in a stepped cylindrical shape using a steel material or the like having a hardness equal to or higher than the sphere 53, and is configured to be in contact with the sphere 53.

Reference numeral 60 denotes a concave recess 58 on the orbiting scroll 12 side.
A rubber plate as an urging member provided in the small-diameter portion 58 </ b> A between the contact member 59 and the rubber member 60. The rubber plate 60 constantly urges the contact member 59 toward the sphere 53. It has become.

Reference numeral 61 denotes an O-ring which is located between the small diameter portion 58A of the recess 58 and the contact member 59 and is provided on the outer peripheral side of the contact member 59 and serves as anti-rattle means. the ring 61 also, O-ring 57 similarly to the contact member 59 is intended to prevent the rattling in the recessed portion 58.

[0077] Thus, in thus configured present embodiment, it is possible to obtain substantially the same operational effects as the fourth embodiment.

In particular, in this embodiment, the concave portions 54, 5
8 and the contact members 55, 59, the O-rings 57, 61 are interposed therebetween.
O-rings 57, 6 cause rattling in concave portions 54, 58.
1, when the contact members 55, 59 are displaced in the concave portions 54, 58 by the elastic force of the rubber plates 56, 60, the contact members 5 against the concave portions 54, 58
The O-ring 57,
61 can prevent this.

In each of the embodiments, the thrust load support 16 (21, 31, 41, 51) includes three spheres 18 in the sphere housing case 17 (22, 32, 42, 52).
Although the case where (23, 33, 43, 53) is accommodated has been described as an example, instead of this, for example, as shown in a first modification shown in FIG.
May be accommodated, or seven spheres 82 may be accommodated in a sphere accommodating case 81 as in the second modification shown in FIG. In addition, eight or more spheres may be provided, or five or six spheres may be provided.

Further, in each embodiment, the case where four thrust load supports 16 (21, 31, 41, 51) are provided in the circumferential direction between the thrust receiver 7 and the orbiting scroll 12 is provided. Although described above, the configuration may be such that five or more thrust load supports are provided instead. Alternatively, as in the third modification shown in FIG. 17, a case mounting groove 7C 'is provided in the thrust receiver 7'. 3 provided, each of these case mounting groove 7
A configuration in which three thrust load supports 16 are provided on C ′ may be adopted.

Here, the thrust receiver 7 'is substantially the same as the thrust receiver 7 according to the first embodiment, and has an annular plate portion 7'.
A ', the cylindrical portion 7B' has and the case mounting groove 7C '.

Further, in each embodiment, the case where the spherical housing case 17 (22) is fixedly provided on the thrust receiver 7 side has been described as an example, but instead, the spherical housing case 17 (22) is provided on the orbiting scroll side. May be provided.

Further, in each of the embodiments, the scroll type air compressor has been described as a scroll type fluid machine. However, the present invention is not limited to this, and can be widely applied to, for example, a refrigerant compressor. is there.

[0084]

As has been described above in detail, according to the invention described in claim 1, the thrust load supporting member, and the spherical housing case secured to one of the back face of the casing and the orbiting scroll, the sphere Since three or more spheres are accommodated in the housing case and three or more thrust load supports are arranged between the casing and the back of the orbiting scroll, three or more thrust load supports are provided for each thrust load support. More than one sphere can be brought into contact with the casing and the orbiting scroll, and each of these spheres can stably support a thrust load acting on the orbiting scroll.

[0085] Thus, a thrust load applied to the orbiting scroll to all spheres of the thrust load supporting member can be supported by evenly distributing the behavior of the orbiting scroll can be stabilized. Moreover, by eliminating a problem such that thrust load acting to concentrate only on a part of a sphere out of the spheres, the spheres of wear, it is possible to reduce damage, extend the life or the like of the scroll fluid machine be able to.

Further, according to the second aspect of the present invention, since the partition member for holding the respective spheres in a non-contact state with each other is provided in the sphere housing case, the sphere is provided between the casing and the orbiting scroll. When the ball rolls, the spheres do not rub against each other, the wear of the spheres can be prevented, and the life of the spheres can be extended.

According to a third aspect of the present invention, at least one of the casing and the back surface of the orbiting scroll is provided with a concave portion at a position corresponding to the sphere, and the concave portion is provided in the concave portion so as to contact the sphere. Since the contact member is provided, even when the casing or the orbiting scroll is formed of a member softer than the sphere, the contact member can prevent the sphere from directly contacting the casing or the orbiting scroll, and the casing or the like can be used. Can be prevented from being worn and damaged by the sphere.

- 0088] Further, the invention of claim 4, since in the recessed portion has a configuration providing a biasing member for biasing the contact member toward the sphere, press the contact member to the spherical body by a biasing member In this state, all the spheres can be stably brought into contact with the contact member, and the sphere can be smoothly rolled between the casing and the orbiting scroll, further stabilizing the behavior of the orbiting scroll. it can be of.

Further, according to the fifth aspect of the present invention, there is provided a rattling preventing means between the concave portion and the contact member for preventing the contact member from rattling in the concave portion. ,
In a state where the contact member is restrained from rattling within the recessed portion, the sphere can be stably contact by the contact member.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a scroll type air compressor according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a thrust receiver, an orbiting scroll, a thrust load support, and the like in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part showing a thrust load support and the like in FIG.

FIG. 4 is an exploded perspective view showing a thrust receiver, an orbiting scroll, a thrust load support, and the like in FIG. 2;

FIG. 5 is an enlarged view showing the thrust load support in FIG. 4 alone;

[6] arrow VI-VI in FIG. 5 a thrust load support
It is a plan view seen from the direction.

FIG. 7 is an exploded perspective view similar to FIG. 4, showing a thrust receiver, an orbiting scroll, a thrust load support, and the like of a scroll-type air compressor according to a second embodiment of the present invention.

FIG. 8 is an enlarged view showing the thrust load support in FIG. 7 alone;

FIG. 9 is a plan view of the thrust load supporter viewed from the direction indicated by arrows IX-IX in FIG. 8;

[10] Third thrust load bearing body of the scroll type air compressor according to the embodiment of the present invention, the contact member or the like 3
It is principal part sectional drawing seen from the same position as (1).

FIG. 11 is an exploded perspective view similar to FIG. 4, showing a thrust receiver, an orbiting scroll, a thrust load support, and the like according to a third embodiment.

FIG. 12 is a sectional view showing a thrust load support, a contact member, a rubber plate, and the like of a scroll type air compressor according to a fourth embodiment of the present invention, viewed from the same position as in FIG. 3;

FIG. 13 is an exploded perspective view similar to FIG. 4, showing a thrust receiver, an orbiting scroll, a thrust load support, and the like according to a fourth embodiment.

FIG. 14 is a cross-sectional view of a main part of a scroll-type air compressor according to a fifth embodiment of the present invention, showing a thrust load support, a contact member, a rubber plate, and the like from the same position as in FIG.

FIG. 15 is a plan view of a thrust load support according to a first modification of the present invention, as viewed from the same position as in FIG. 6;

FIG. 16 is a plan view of a thrust load support according to a second modification of the present invention as viewed from the same position as in FIG. 6;

FIG. 17 is an exploded perspective view similar to FIG. 4, showing a thrust receiver, an orbiting scroll, a thrust load support, and the like according to a third modification of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 7, 7 'Thrust receiver 8 Fixed scroll 9 Drive shaft 12 Orbiting scroll 13 Compression chamber 16, 21, 31, 41, 51 Thrust load support 17, 22, 32, 42, 52, 71, 81 Spherical case 18 , 23,33,43,53,72,82 spheres 24, 34, 44 partition member 35,37,45,48,54,58 recessed portions 36,38,46,49,55,59 contact member 47, 50, 56, 60 Rubber plate (biasing member) 57, 61 O-ring (rattle prevention means)

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Toshio Inoue 1116 Koen, Ayase-shi, Kanagawa Prefecture Tokiko Co., Ltd.F-term (reference) in Sagami Plant 3H029 AA02 AA17 AB02 AB06 BB24 BB44 CC03 CC05 CC09 CC17 3H039 AA03 AA12 BB01 BB04 BB05 CC02 CC08 CC23 CC33

Claims (5)

[Claims] 1. A casing, a fixed scroll provided on the casing, a drive shaft rotatably provided on the casing, and a fixed scroll provided rotatably at a distal end side of the drive shaft. An orbiting scroll defining a plurality of compression chambers, an anti-rotation mechanism for preventing the orbiting scroll from rotating, and a thrust provided between the casing and the back of the orbiting scroll to support a thrust load acting on the orbiting scroll. A scroll-type fluid machine including a load support, wherein the thrust load support is fixedly provided on one of the casing and the back surface of the orbiting scroll; And three or more spheres are provided on the casing and are in rolling contact with the rear surface of the orbiting scroll. Last load support scroll fluid machine being characterized in that the construction of arranging three or more between the back of the orbiting scroll and said casing. 2. The scroll-type fluid machine according to claim 1, wherein a partition member for holding the respective spheres in a non-contact state is provided in the sphere housing case. 3. A concave portion is provided on at least one of the casing and the back surface of the orbiting scroll at a position corresponding to the spherical body, and a contact member for contacting the spherical body is provided in the concave concave portion. The scroll type fluid machine according to claim 1 or 2, wherein 4. The scroll-type fluid machine according to claim 3, wherein an urging member for urging the contact member toward a sphere is provided in the concave portion. 5. An anti-rattle means for preventing rattling of the contact member in the concave portion between the concave portion and the contact member. Scroll fluid machine.